<template>
  <div class="star" :class="starType">
    <span 
      v-for="(itemClass,index) in itemClasses"
      :key="index"
      :class="itemClass"
      class="star-item">
    </span>
  </div>
</template>

<script>
const LENGTH = 5
const CLS_ON = 'on'
const CLS_HALF = 'half'
const CLS_OFF = 'off'

export default {
  props: {
    size: {
      type: Number
    },
    score: {
      type: Number
    }
  },
  computed: {
    starType () {
      return 'star-' + this.size
    },
    itemClasses () {
      let result = []
      const score = Math.floor(this.score * 2) / 2
      const hasDecimal = score % 1 !== 0
      const integer = Math.floor(score)
      for (let i = 0; i < integer; i++) {
        result.push(CLS_ON)
      }
      if (hasDecimal) {
        result.push(CLS_HALF)
      }
      while (result.length < LENGTH) {
        result.push(CLS_OFF)
      }
      return result
    }
  }
}
</script>

<style lang="stylus" scoped>
  @import "~styles/stylus/mixin"

  .star
    display: flex
    align-items: center
    justify-content: center
    .star-item
      background-repeat: no-repeat
    &.star-48
      .star-item
        width: .4rem
        height: .4rem
        margin-right: .44rem
        background-size: .4rem .4rem
        &:last-child
          margin-right: 0
        &.on
          bg-image('star48_on')
        &.half
          bg-image('star48_half')
        &.off
          bg-image('star48_off')
    &.star-36
      .star-item
        width: .3rem
        height: .3rem
        margin-right: .12rem
        background-size: .3rem .3rem
        &:last-child
          margin-right: 0
        &.on
          bg-image('star36_on')
        &.half
          bg-image('star36_half')
        &.off
          bg-image('star36_off')
    &.star-24
      .star-item
        width: .2rem
        height: .2rem
        margin-right: .06rem
        background-size: .2rem .2rem
        &:last-child
          margin-right: 0
        &.on
          bg-image('star24_on')
        &.half
          bg-image('star24_half')
        &.off
          bg-image('star24_off')
</style>
